I don’t have exact answers but there is Robo Recall source code (you can get it from Epic launcher). It uses day/night lighting scenario in multiple levels so you can play with it.
Btw, I’m no professional but, lighting scenario seems more suitable for small scenes because the ability to save multiple light BuiltData is where it shines. For a huge scale map you’re not gonna cook the lightmaps anyway. Why not just control the lighting (street lamps, day/night cycles etc.) with code & more freedom.